Messages in this thread | | | Date | Fri, 31 May 2002 16:02:53 -0700 (PDT) | From | Linus Torvalds <> | Subject | Re: [patch 5/18] mark swapout pages PageWriteback() |
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On Fri, 31 May 2002, Andrea Arcangeli wrote: > > In short the same way MAP_ANON must pageout correctly, also MAP_SHARED > must swapout correctly with very vm intensive conditions.
That is true, but it is ignoring the fact that there _are_ real technical differences between swap cache mappings and regular shared mappings.
One major difference is the approach to the last user: a last use of a shared mapping still needs to write out dirty state, while the last use of a swap page is better off noticing that it should just optimize away the write, and we can just turn the page back into a dirty anonymous page.
But the differences are much smaller than many of the similarities.
Linus
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